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serial data over ethernet on a linux box

I'm trying to connect a widget (192.168.1.214:20108) through Ethernet (serial to Ethernet) to a Linux box. Under Windows using a virtual device driver mapping I can see the serial data, so I know ...
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RJ-45 <-> RS-232, can I substitute the RS-232 side and abuse my Ethernet port as COM port?

We have a PCIX board (with MIPS CPU) from some vendor and it has an RJ-45 jack on the "board-side", where the cable has an RS-232 plug on the other side. The expected protocol is clearly the same as ...